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Metal oxide microparticles, transparent conductive film, and dispersion

a technology of metal oxide microparticles and transparent conductive films, applied in the field of new materials, can solve the problems of limited application and inferior storage stability of transparent conductive films disclosed in these proposals, and achieve the effect of high transparency and conductivity, excelling in flexibility and storage stability

Inactive Publication Date: 2009-09-17
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]An object of the present invention is to provide novel sheet-shaped metal oxide microparticles having a width (minor axis length) and a length (major axis length) of 0.05 μm to 100 μm, respectively and having a thickness of 2 nm to 1,000 nm, a transparent conductive film which has high transparency and conductivity and excels in flexibility and storage stability, and a dispersion.
[0032]The present invention can solve the above-described problems, and can provide: novel sheet-shaped metal oxide microparticles having a width and a length of 0.05 μm to 100 μm, respectively and having a thickness of 2 nm to 1,000 nm; a transparent conductive film which has high transparency and conductivity and excels in flexibility and storage stability; and a dispersion.

Problems solved by technology

Due to high resistivity, applications thereof are limited.
Therefore, the transparent conductive films disclosed in these proposals are inferior in storage stability.

Method used

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  • Metal oxide microparticles, transparent conductive film, and dispersion
  • Metal oxide microparticles, transparent conductive film, and dispersion
  • Metal oxide microparticles, transparent conductive film, and dispersion

Examples

Experimental program
Comparison scheme
Effect test

production example 1

—Preparation of Silver Nanowires 1—

[0099]170 ml of ethylene glycol was heated at 160° C. for one hour. 50 ml of ethylene glycol solution of 0.1 mM chloroplatinic acid (IV) hexahydrate was added thereto. Seperately, 1.70 g of silver nitrate and 2.25 g of polyvinyl pyrrolidone (weight-average molecular weight 40,000) were dissolved in 200 ml of ethylene glycol. The resulting solution was added at a rate of 6 ml per minute. After the addition, the mixture was further heated at 160° C. for 30 minutes and then cooled to room temperature. Ethanol was added to the mixture, followed by centrifugation to purify the product. The product was dispersed by the addition of N,N-dimethylformamide to thereby prepare a dispersion containing 2% Ag by mass.

[0100]For the prepared dispersion, the length and width of the silver nanowires were measured and an aspect ratio was determined. It was found that silver nanowires 1 were formed that have a length (major axis length) of several μm, a width (minor ax...

production example 2

—Preparation of Ag Nanoparticles 1—

[0101]3.4 g of silver nitrate and 4.2 g of polyvinylpyrrolidone (weight-average molecular weight 40,000) were dissolved in 200 ml of water. To this solution, was added 20 ml of 2-diethylaminoethanol and stirred for 20 minutes to obtain a yellowish brown reaction product. Ethanol was added to the mixture, followed by centrifugation to purify the product. The product was dispersed by the addition of N,N-dimethylformamide to thereby prepare a dispersion containing 2% Ag by mass.

[0102]Ag nanoparticles 1 with a mean particle diameter of 8 nm were formed in the prepared dispersion.

production example 3

—Preparation of Metal Oxide Microparticles 1—

[0103]0.66 g of zinc acetate dihydrate and 30 mg of aluminum (III) isopropoxide were dissolved in 30 ml of ethylene glycol. To this solution, was added 1.20 g of sodium hydroxide dissolved in 60 ml of ethylene glycol. The mixture was stirred for 8 hours while heating at 170° C. After cooling to room temperature, ethanol was added to the mixture, followed by centrifugation to thereby purify the product. Then, the product was dispersed in a mixture of 60 vol. % isopropanol, 20 vol. % N-methylpyrrolidone, and 20 vol. % ethylene glycol using a nanomizer (product of Tokai Corporation) to prepare a dispersion containing 10% AZO by mass.

[0104]For the prepared dispersion, it was found that AZO (Al-doped ZnO) nanosheets were formed that had a width (minor axis length) and a length (major axis length) of 50 nm to several μm, respectively, and had an average thickness of 200 nm (FIG. 1). X-ray diffraction (XRD; product of Rigaku Denki Co., RINT2500)...

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Abstract

The present invention provides a transparent conductive film including metal oxide microparticles having a mean particle diameter of 2 nm to 1,000 nm and silver nanowires having a minor axis diameter of 2 nm to 100 nm and an aspect ratio of 10 to 200.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to novel sheet-shaped metal oxide microparticles, and to a transparent conductive film and a dispersion that have high transparency and conductivity, and excel in storage stability.[0003]2. Description of the Related Art[0004]As a transparent conductive film, antimony- or fluorine-doped tin oxide films, tin- or zinc-doped indium oxide films, aluminum- or gallium-doped zinc oxide films, and the like have been known. The transparent conductive films are applied to, for example, transparent electrodes in liquid crystal display elements, plasma emission elements, electronic papers, etc., transparent electrodes for solar cells, heat-reflecting films, antistatic films, transparent heating elements, touch panels, electromagnetic wave shielding films, and the like.[0005]In general, the transparent conductive film is produced by vapor deposition methods such as sputtering method, chemical vapor depo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B5/16B32B9/00B32B15/02B82B1/00
CPCH01B1/16H05K1/097Y10T428/256H05K2201/0326Y10T428/2982H05K2201/0108
Inventor HIRAI, HIROYUKI
Owner FUJIFILM CORP
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